JVM IR: do not generate extension receiver parameter as ACC_MANDATED

Otherwise Java reflection is not able to load its type as a
parameterized type.

 #KT-40857 Fixed

compiler/ir/backend.jvm/codegen/src/org/jetbrains/kotlin/backend/jvm/codegen/FunctionCodegen.kt

@@ -337,7 +337,7 @@ private fun IrValueParameter.isSyntheticMarkerParameter(): Boolean =
 
 private fun generateParameterNames(irFunction: IrFunction, mv: MethodVisitor, state: GenerationState) {
     irFunction.extensionReceiverParameter?.let {
-        mv.visitParameter(irFunction.extensionReceiverName(state), Opcodes.ACC_MANDATED)
+        mv.visitParameter(irFunction.extensionReceiverName(state), 0)
     }
     for (irParameter in irFunction.valueParameters) {
         // A construct emitted by a Java compiler must be marked as synthetic if it does not correspond to a construct declared